No blockchain currently has the scale for this. FWIW, Visa couldn't handle this either. Youtube alone serves over 10,000 videos per second to just mobile clients. Add in podcasts, text content, music, games, etc. and it's a monumental task.

You don't have to be as big as youtube. The only infrastructure you need is ingestion points for all the feeds, and then reporting mechanisms. The ingestion can just go into an autoscaling group. At that point your cloud costs track almost directly with your revenue, so a big AWS bill is a good sign.